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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkColor.h"
#include "SkDashPathEffect.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkPathEffect.h"
#include "SkPoint.h"
#include "SkRect.h"
#include "SkRefCnt.h"
#include "SkScalar.h"
#include "SkSurface.h"
#include "SkTypes.h"
#include "Test.h"
#include <cmath>
static const SkColor bgColor = SK_ColorWHITE;
static void create(SkBitmap* bm, SkIRect bound) {
bm->allocN32Pixels(bound.width(), bound.height());
}
static void drawBG(SkCanvas* canvas) {
canvas->drawColor(bgColor);
}
/** Assumes that the ref draw was completely inside ref canvas --
implies that everything outside is "bgColor".
Checks that all overlap is the same and that all non-overlap on the
ref is "bgColor".
*/
static bool compare(const SkBitmap& ref, const SkIRect& iref,
const SkBitmap& test, const SkIRect& itest)
{
const int xOff = itest.fLeft - iref.fLeft;
const int yOff = itest.fTop - iref.fTop;
for (int y = 0; y < test.height(); ++y) {
for (int x = 0; x < test.width(); ++x) {
SkColor testColor = test.getColor(x, y);
int refX = x + xOff;
int refY = y + yOff;
SkColor refColor;
if (refX >= 0 && refX < ref.width() &&
refY >= 0 && refY < ref.height())
{
refColor = ref.getColor(refX, refY);
} else {
refColor = bgColor;
}
if (refColor != testColor) {
return false;
}
}
}
return true;
}
/** Test that drawing glyphs with empty paths is different from drawing glyphs without paths. */
DEF_TEST(DrawText_dashout, reporter) {
SkIRect size = SkIRect::MakeWH(64, 64);
SkBitmap drawTextBitmap;
create(&drawTextBitmap, size);
SkCanvas drawTextCanvas(drawTextBitmap);
SkBitmap drawDashedTextBitmap;
create(&drawDashedTextBitmap, size);
SkCanvas drawDashedTextCanvas(drawDashedTextBitmap);
SkBitmap emptyBitmap;
create(&emptyBitmap, size);
SkCanvas emptyCanvas(emptyBitmap);
SkPoint point = SkPoint::Make(25.0f, 25.0f);
SkPaint paint;
paint.setColor(SK_ColorGRAY);
paint.setTextSize(SkIntToScalar(20));
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setLCDRenderText(true);
paint.setStyle(SkPaint::kStroke_Style);
// Draw a stroked "A" without a dash which will draw something.
drawBG(&drawTextCanvas);
drawTextCanvas.drawText("A", 1, point.fX, point.fY, paint);
// Draw an "A" but with a dash which will never draw anything.
paint.setStrokeWidth(2);
constexpr SkScalar bigInterval = 10000;
static constexpr SkScalar intervals[] = { 1, bigInterval };
paint.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 2));
drawBG(&drawDashedTextCanvas);
drawDashedTextCanvas.drawText("A", 1, point.fX, point.fY, paint);
// Draw nothing.
drawBG(&emptyCanvas);
REPORTER_ASSERT(reporter, !compare(drawTextBitmap, size, emptyBitmap, size));
REPORTER_ASSERT(reporter, compare(drawDashedTextBitmap, size, emptyBitmap, size));
}
// Test drawing text at some unusual coordinates.
// We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdCoordinates, r) {
auto surface = SkSurface::MakeRasterN32Premul(10,10);
auto canvas = surface->getCanvas();
SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f };
for (auto x : oddballs) {
canvas->drawString("a", +x, 0.0f, SkPaint());
canvas->drawString("a", -x, 0.0f, SkPaint());
}
for (auto y : oddballs) {
canvas->drawString("a", 0.0f, +y, SkPaint());
canvas->drawString("a", 0.0f, -y, SkPaint());
}
}
// Test drawing text with some unusual matricies.
// We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdMatricies, r) {
auto surface = SkSurface::MakeRasterN32Premul(100,100);
auto canvas = surface->getCanvas();
SkPaint paint;
paint.setAntiAlias(true);
paint.setLCDRenderText(true);
struct {
SkScalar textSize;
SkScalar matrix[9];
} testCases[] = {
// 2x2 singular
{10, { 0, 0, 0, 0, 0, 0, 0, 0, 1}},
{10, { 0, 0, 0, 0, 1, 0, 0, 0, 1}},
{10, { 0, 0, 0, 1, 0, 0, 0, 0, 1}},
{10, { 0, 0, 0, 1, 1, 0, 0, 0, 1}},
{10, { 0, 1, 0, 0, 1, 0, 0, 0, 1}},
{10, { 1, 0, 0, 0, 0, 0, 0, 0, 1}},
{10, { 1, 0, 0, 1, 0, 0, 0, 0, 1}},
{10, { 1, 1, 0, 0, 0, 0, 0, 0, 1}},
{10, { 1, 1, 0, 1, 1, 0, 0, 0, 1}},
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1305085 .
{ 1, {10, 20, 0, 20, 40, 0, 0, 0, 1}},
};
for (const auto& testCase : testCases) {
paint.setTextSize(testCase.textSize);
const SkScalar(&m)[9] = testCase.matrix;
SkMatrix mat;
mat.setAll(m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8]);
canvas->setMatrix(mat);
canvas->drawString("Hamburgefons", 10, 10, paint);
}
}
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